问题:
当x=3,y=-
1
2
时,求(x+y)(x 2-xy+y 2)-(x 3-y 3)的值.
当x=3,y=-
时,求(x+y)(x 2-xy+y 2)-(x 3-y 3)的值.
1 |
2 |
参考答案: